THE WHEEL ANIMALCULES (ROTATORIA) 615 



121 (no) Fixed by the tip of the stalk-like foot, or with tubes, or in colonies, 

 Secondarily free in a few cases, then distinguishable by the 

 soft elongated body, without lorica or appendages. 



Family MELICERTIDAE . . 122 



122 (130, 133) Individuals attached, separate, or in branching, non-spherical 

 colonies of few specimens (1-30) 123 



123 (124, 125) Corona four lobed Melicerta Schrank. 



Two lobes in one species. Living in tubes. Several species. 



Representative species (Fig. 948 and Fig. 866, A, page 575). 



Melicerta ringens Schrank. 



124 (123, 125) Corona eight lobed Octotrocha Thorpe. 



Representative species (Fig. 950). . . . Octotrocha speciosa Thorpe. 



125 (123, 124) Corona more or less two lobed 126 



126(129) Dorsal antenna minute or absent 127 



127 (128) Corona broad, of two lobes, with a wide dorsal gap. 



Limnias Schrank. 



Dorsal antenna minute, ventral antennae long; living in tubes not made with pellets. Sev- 

 eral species. 



Representative species (Fig. 949). . . Limnias ceratophylli Schrank. 



128 (127) Corona a wide oval or nearly circular, indistinctly two lobed. 

 Dorsal gap minute Oecistes Ehrenberg. 



Dorsal antenna inconspicuous or absent. Ventral antennae obvious. Living attached in 

 tubes. Many species. 



Representative species (Fig. 951) Oecistes brevis Hood. 



